Foot-lever for grindstones.



Hans Oktad v Wilt "(zoom H;- OLS TAD. v FOOT LEVER FOR GR|NDSTONES.APPLICATION FILED 056.27, I912.

1,144,375. Patented June 29, 1915.

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TH: NURRI: PhlzNS CO. PHOTO-LITHO. WASHINGTON, D, C.

HANS OLSTAD, OF ELSWORTH, NORTH DAKOTA.

FOOT-LEVER FOR GRIND-STONES.

Specification of Letters Patent.

Patented June 29, 1915.

Application filed December 27, 1912. Serial No. 738,874.

To all whom it may concern:

Be it known that I, HANS OLSTAD, a citizen of the United States,residing at Elsworth, in the county of McKenzie and State of NorthDakota, have invented new and useful Improvements in Foot-Levers forGrindstones, of which the following is a specification.

This invention relates to an improved motor for use primarily withgrindstones or the like and comprehends construction of a simple deviceby which the grindstone may be readily and conveniently operated by oneor two users.

The main object of the present invention is the provision of a footpower device arranged particularly with relation to the frame of agrindstone and constructed for convenient use by either one or twooperators.

The invention in its preferred form of details will be described in thefollowing specification, reference being had to the accompanyingdrawings, in which Figure 1 is a view in side elevation of the improvedpower motor showing the same in use in connection with a grindstone.Fig. 2 is a plan view of the same, the grindstone being omitted.

Referring particularly to the accompanying drawings, the improved motoris shown in connection with a grindstone including a bed frame 1 inwhich the grindstone 2 is revolubly mounted on a shaft 3. Secured to theshaft at one side of the bed frame is a sprocket wheel 4:, and mountedon cross bars 5 of the supports 6 for the bed frame is a second shaft 7on which is arranged a sprocket 8, connected with the sprocket 4 by asprocket chain 9.

The respective sprockets 4 and 8 are ar ranged in vertical alinement,and in the use of the device with a grindstone the sprocket 8 ismaterially greater in diameter than the sprocket 4 to gain speed, aswill be understood.

Secured to the supports 6 on one side of the frame is a stringer 10 andslidably mounted on said stringer at each end thereof is a pivot block11. The pivot block is limited in its sliding movement in bothdirections, and may be fixed for sliding movement with relation to thestringer in any desired manner. Pivoted to each pivot block is one endof a foot lever 12, the opposite end of which is formed to present atreadle portion 13. The shaft 7 beyond the sprocket Wheel 8 is formed toprovide a crank 14 and to the free end of this crank is connected by apivotal connection the respective levers 12. As previously described,and as seen from the drawings, the respective levers extend in oppositedirections, that is, the treadle portions of the levers are disposedadjacent the respective ends of the frame. If desired, the bed plate 1may be provided at an appropriate point with saddles or seats 15, twosuch seats being provided one at each end of the frame, the seats beingso disposed that the operator can when seated thereon, convenientlyreach the treadle portion of the underlying lever.

From the above description it will be obvious that I have provided ameans whereby a grindstone may be conveniently operated by either one ortwo operators and in the latter instance both such operators may use thegrindstone for grinding purposes. The movable connection of the pivotedend of the lever permits its necessary longitudinal movement as will beobvious.

While showing and describing the invention as applied to the grindstonesit will be obvious that it is readily adapted for other uses of asimilar nature and such are con templated.

What is claimed is A motive power for grindstones including a drivewheel having a crank portion, a frame supporting said wheel, pivotblocks arranged at the opposite ends of the frame and capable of alimited, pivotal, longitudinal movement, levers pivotally connected tothe respective pivot blocks and extend ing therefrom toward each otherand connected to the crank, the free ends of the levers being formed toprovide treadle portions.

In testimony whereof I affix my signature in presence of two witnesses.

HANS OLSTAD.

Witnesses:

RoBnR'r NoRrnnM. FRED LARSON.

flopies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents.

Washington, D. 0.

